Double-acting pipe-wrench.



R. J. COSSEBOOM.

DOUBLE ACTING PIPE WRENCH.

APPLICATION FILED MAR. 6, 1915.

1 1. 50,663. Patented Aug. 17, 1915.

A T TOR/V5 VS To all whom it may concern pnrrnn srarns na'rnn'r @FMQIE.

ROBERT J. COSSEBOOM, OF BUENA VISTA, COLORADO, ASSIGNOR OF ONE-FOURTH TO DANIEL G. SINIDLINGER AND ONE-FOURTH TO CHARLES A. NILES, BOTH 0F BUENA VISTA, COLORADO.

DOUBLE-ACTING PIPE-WRENCH.

Application filed March 6, 1915.

Be it known that 1, ROBERT J. CossnnooM, a citizen of the United States, and a resident of Buena Vista, in the county of Chaffee and State of Colorado, have invented a certain new and useful Improvementin Double- Acting Pipe-Wrenches, of which the following is a specification.

This invention relates to an improvement in wrenches, and more particularly to that class of wrenches in which a flexible chain is utilized in gripping the work.

One of the principal objects ofthe invention is to provide an improved wrench of the type set out having a claw or aw shiftable longitudinally of the wrench into engagement with the work to exert a binding force thereagainst in a direction opposed to that of the chain, and in such manner that the wrench may be manipulated either direction without danger of slipping.

Another-object'is to provide a wrench of the class described having a longitudinally shiftable claw and having a lever adapted simultaneously and by manipulation in a single direction, to operate both the chain and claw in opposite directions, whereby to exert opposed'tensions upon the work and thereby positively lock the wrench thereon.

A further object is to provide such a wrench as I have disclosed having few parts readily detachable from each other for repair or renewal.

Still another object is to provide a device of the class described which will be extremely simple, durable, efficient in operapanying drawings in which like characters of reference indicate like parts throughout the several figures of which Figure 1 represents a view in side elevation of a wrench constructed according to my invention, the parts being shown in the Specification of Letters Patent.

Patented Aug. 17, 1915.

Serial No. 12,544.

position taken just prior to the final binding movement of-the lever; Fig. 2 represents a vlew in side elevation, with one of the walls of the handle removed, showing the wrench in final locked position upon a pipe section; Fig. 3 represents a view in section taken vertically and transversely through the handle on the plane indicated by the line 3-3 of Fig. 2; Fig. 4 represents a view in perspective of the claw and its shank removed from the wrench; Fig. 5 represents a view in section taken vertically and transversely through the wrench on the plane indicated by the line 55 of Fig. 2.

In carrying out my invention, I provide a wrench handle indicated generally at 5 of substantially a semi-tubular or U-shape in cross-section. The outer end of handle 5 is reduced as at 6 to provide a hand hold. The inner end of the handle is flared in opposite directions to provide pairs of spaced ears indicated at 7 and 8 respectively. Ears 8 are provided on the floor or closed side of handle 5, and are defined by an opening at 9 cut in the floor in the inner end ofv the handle. Through this opening extends one terminal link of a chain 10, said link being pivotally connected between the side walls of the handle by means of a screw or other suitable fastening element 11.

Between the ears 7 which occur on the open side of the handle is pivoted at its inner end, a lever 12. A screw or other suitable element 13 is utilized in detachably pivoting the lever to the handle. The outer end of the handle 14 is offset whereby to engage within the channel of the reduced end 6 of the handle when said lever and handle are in closed position as indicated in Fig. 2. Lever 12 is provided on its outer surface a short distance from pivot point 13, with a lug 15 having a recessedside 16 adapted to engage one of the pintles of the chain in the manner indicated in Fig. 1 when the lever is in outwardly swung position with regard to the handle, so that when the lever is swung against the handle, the chain will be tightened about the work and exert a tension thereagainst in the direction of the handle. The lug or spur 15 projects as will be seen toward the outer end of lever 14:.

Slidably disposed between the side walls of the handle at the inner ends thereof, is a shank 17 provided at spaced intervals with a plurality of elongated openings or slots 18.] The shank is shiftable longitudinally of the handle and is maintained in position in the handle by means of a plurality of removable screws or other fastening elements 19. These screws limit the longitudinal shifting movement of the shank. At its outer end the shank is provided with a jaw or claw 20 provided with a concaved serrated gripping surface 21. The lateral edges of the claw extend beyond the sides of shank 17 and form shoulders 22 which abut against the edges of the side walls of the handle at their outer ends, when the shank is in retracted position.

At its inner end the shank is provided with a central longitudinally extending bore 23 in which a coiled spring 24: is disposed. This spring at one end bears against one of the screws 19 with whose receptive opening 18 the bore 23 merges, and at its opposite end said springbears against a threaded plug 25 turned into the outer end of bore 23. The spring thus bearing against the stationary screw and against the plug which is movable with the shank, exerts. a tension against said shank for normally maintaining the latter in retracted position within the handle.

The upper surface of shank 17 adjacent the claw 20 and near ears 7, is provided with a concave bearing portion 26 for the reception of a cam 27 formed on the inner end of lever 12 adjacent the pivot point 13. The terminal of bearing 26 on its upper side is defined by a lug or shoulder 28, adapted to be engaged by shoulder 29 provided on lever 12 adjacent the cam 27 when the lever is moved into its ultimate outward position, whereby to limit the outward movement of said lever. When the lever is in the outwardly swung position indicated in Fig. 1, the cam 27 is not in engagement with its bearing, but projects within the cavity in 2.

- ,loose manner. When, however, the lever is swung inwardly into the position shown in Fig. 2, the cam 27 in moving forwardly engages against the portion of the recess 26 defined by the rear surface of claw 20 whereby to move said claw outwardly against the tension of spring 2& and into engagement with the work in the manner indicated. This outwardly shifting movement of the claw or jaw is attained simultaneously with the opposite binding movement of the chain in being stretched upon the work through action of the lever, so that it will be seen that the tension of the chain and claw are taneously with the inward shifting "movement, and hence relaxation of the tension of the claw or jaw, by reason of the spring control of the latter, so that a full unlocking movement of the wrench relatively to the work, is thus provided by merely shifting the lever outwardly.

Although I have described the preferred embodiment of my invention, I may desire to make such changes in the construction, combination and arrangement of parts there of as do not depart from the spirit .of the invention and the scope of the appended.

claims.

. I claim i 1. A wrench comprising a substantially U-shaped handle having oppositely disposed pairs of ears provided at its inner end, a

shank shiftable longitudinally of said handle and disposed therein, means for limiting the shifting movement of the shank, a serrated claw provided on the shank and movable into engagement with a piece of work, spring means for maintaining the claw normally in retracted position, a flexible chain pivoted at one end betweenone of said pair of ears, a lever pivoted-at its inner end between the opposite pair of ears, a lug provided' on said lever and adapted to engage said chain whereby to tighten the latter against the work when the lever is moved inwardly, a bearing provided in the shank adjacent the claw, a cam provided on the lever and movable into engagement with said bearing when the lever is'moved inwardly whereby to shift said claw outwardly into engagement with the work, and coacting means between the leverandclaw for limiting the outward movement of the former.

. 2. A wrench comprising a substantially U-shaped handle, a shank disposed within the handle and movable longitudinally thereof, said shank being provided with a plurality of spaced elongated openings, removable elements carried by the handle and engaging through said openings, said elements adapted to limit themovements ofthe shank, a claw carried by said shank and movable into engagement with a piece of work when said shank is shifted outwardly,

said shank at its inner end being provided with a bore merging with one of the open-v ings in the shank, a plug disposed in the outer end of the bore, a spring disposed bemeans between said lever and claw whereby 10 to shift the latter outwardly into engagement with the work simultaneously with the locking movement of the chain.

ROBERT J. COSSEBOOM.

Witnesses:

RoBT. BRIGGS, GEORGE F. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

